Jet directive device



Dec. 20, .1949 R H, GODDARD 2,491,610

JET DIRECTIVE DEVICE Filed Feb. 23, 1946 Puentes Dec. zo, 1949 JETDIRECTIVE DEVICE This invention relates diverting portions of a j etRobert H. Goddard, Md., by Esther C. ass., assigner of one FlorenceGuggenheim N. Y., a corporation of Application February z3, 194 s,serial No.

deceased, Goddard,

-half to The Daniel and Foundation, New York, New York late ofAnnapolis, executrix, Paxton,

4 Claims. (Cl. 6035.6)

to devices for angularly and for striating the Jet to increase theentraining capacity thereof. The

invention is particularly adapted for use in connection withair-entraining augmenter tubes in rocket propulsion apparatus. In suchapparatus as used in jet propulsion, a small compact jet of combustiongases moving at very high speed has very low propulsive efficiency butthis low efficiency may be greatly increased by entraining with thecombustion gases a substantial quantity of air. The resulting mixture ofgas and air has greatly increased mass and correspondingly decreasedspeed and is for propulsion purposes.

found much more emcient It is the general object of the invention toincrease the entraining effectiveness of such jets by the provisionV offurther object adapted for use improved directive devices. A is toprovide directive devices iin an augmenter where the jetproducingapparatus is disposed at a substantial angle to the axis of theaugmenter tube.

The invention further relates to arrangements and combinations of partswhich will be herein! after described and more particularly pointed outin the appended Preferred forms of the invention are shown in thedrawing, in

claims.

which Fig. l is a sectional side elevation of a portion of an augmentertube, with the improved directive devices lassociated therewith;

Fig. 2 is a longitudinal sectional view of the directive devices,

partly in perspective;

Fig. 3 is a transverse sectional view, taken along the line 3-3 in Fig.l; and Fig. 4 is a sectional view similar to Fig. i imi-I showing amodified construction.

Referring to the drawing, an augmenter tube llis shown, through which aflow of air is induced by combustion gases developed in a combustionchamber Il through a nozzle nozzle N opens at a substantial The improvedrality of deiiectors C and delivered into the tube N. It will be notedthat the into the side of the tube l and angle to the axis of the tube.

directive devices comprise a plu- 2t mounted in the nozzle Nandextending lengthwise thereof. The devices Il are curvedlongitudinally as shown in Fig. 2 and are also somewhat sharply curvedtransverselyas shown in all of the devices side of said' no Each device2l Fig. 3. It will be noted that 2l are concave toward the long zzle asshown in the drawings. is mounted on a supporting web 22 extendingoutward to the more closely adjacent the nozzle N is curvedlongitudinally, and the deectors 40 are somewhat more sharply curvedlongitudinally than is the case With the straight conical constructionof the nozzle N as shown in Figs. 1 and 2.

In both cases, the distribution oi the deiiectors 2li or 40 ispreferably as shown in Fig. 3, and this distribution is well adapted toproduce a substantially uniform distribution of the combustion gasesover the cross sectional area of the augmenter tube.

By the 'provision of such. directive devices, the combustion gases aregradually displaced into alignment with the axis of the augmenter 'tubeand this displacement occurs without shock or substantial change invelocity, thusconserving the ventraining power of the jet.

Having thus described the invention and the advantages thereof, it willbe understood that the invention is not to be limited to the detailsherein disclosed, otherwise than as set forth in the claims, but thatwhat is claimed is:

1. In a jet directive device an augmenter tube, a combustion chamber, aconical discharge nozzle for said chamber mounted in one side wall ofsaid tube and having its axis substantially inclined to the axis of saidtube, and a plurality of jet deflectors mounted in said nozzle andextending longitudinally thereof, all of said deflectors being curvedlongitudinally and in the same direction with respect to the axis ofsaid nozzle and being effective to deflect the combustion gases Vawayfrom said axis and all in the same direction, and all of said deflectorsbeing curved transversely and presenting deflecting surfaces which areconcave toward that side of the nozzle toward which the gases aredeflected.

2. In a jet directive device. an augmenter tube, a combustion chamber,la conical discharge nozzle for said chamber mounted in one side Wall ofliiecting surfaces which said tube and having its axis substantiallyinclined to the axis of said tube, and a plurality of Jet detlectorsmounted in said nozzle and extending longitudinally thereof, all of saiddeiiectors being curved longitudinally and in the same direction withrespect to the axis of said nozzle and being effective to deilect thecombustion gases away from the axis of said nozzle and all in the samedirection, all of said deectors being curved transversely and presentingdeare concave toward that side of the nozzle toward which the gases aredeflected, and each deflector having a web by which it is supported onthe nozzle wall but in spaced relation thereto.

3. In a jet directive device, an augmenter tube, a combustion chamber, adischarge nozzle mounted in one side wall of said augmenter tube andsubstantially inclined relative to the axis thereof, and a pluralityA ofdefiectors mounted in said nozzle, said deectors being archedlongitudlnaily toward the short side of the nozzle and being curvedtransversely to present deilecting surfaces which are concave toward thelong side of the nozzle, and said deflectors being effective to divertcombustion gases from the axis of said nozzle toward the axis of saidaugmenter tube.

4. In a jet directive device, an augmenter tube. a combustion chamber, adischarge nozzle mounted at one side wall of said'augmenter tube andsubstantially inclined relative to the axis thereof, and a. plurality ofdefiectors mounted in said nozzle, said deilectors being archedlongitudinally toward the short side of the nozzle and being curvedtransversely to present deilecting surfaces which are concave toward thelong side of the nozzle, said deflectors being effective to divertcombustion gases from the axis of said nozzle toward the axis oi' saidaugmenter tube, and said deflectors being relatively spaced andpositioned to distribute the combustion gas substantially uniformly overthe cross sectional area of the augmenter tube.

ESTHER C. GODDARD, Emecutria: of the Last Will and Testament of RobertH. Goddard, Deceased.

REFERENCES CITED UNITED STATES PATENTS Name Date Birkigt May 9. 1944Number

